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This was a topic that I've seen come up several times regarding when you target someone or something, it creates these red outlines that many wish didn't exist or were softer. They have confirmed that you will have the option to turn them off. Hopefully this puts that concern to rest now for those it bothered.
Will there be an option to turn off the glow around enemies? – By Nate Collins
Yes, you will be able to turn it off. I will say that the glow is much more apparent when you’re watching than it is when you’re playing. It’s very effective at helping with target selection, and you may find it useful in some situations, but it’s up to you whether to enable it.
Here is the rest of the Q&A if interested.
There Is Always Hope!